71490565 has 4 divisors (see below), whose sum is σ = 85788684. Its totient is φ = 57192448.

The previous prime is 71490563. The next prime is 71490583. The reversal of 71490565 is 56509417.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56509417 = 257 ⋅219881.

It can be written as a sum of positive squares in 2 ways, for example, as 24581764 + 46908801 = 4958^2 + 6849^2 .

It is a cyclic number.

It is not a de Polignac number, because 71490565 - 2¹ = 71490563 is a prime.

It is a super-2 number, since 2×71490565² = 10221801768038450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71490563) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7149052 + ... + 7149061.

It is an arithmetic number, because the mean of its divisors is an integer number (21447171).

Almost surely, 2^71490565 is an apocalyptic number.

It is an amenable number.

71490565 is a deficient number, since it is larger than the sum of its proper divisors (14298119).

71490565 is a wasteful number, since it uses less digits than its factorization.

71490565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14298118.

The product of its (nonzero) digits is 37800, while the sum is 37.

The square root of 71490565 is about 8455.2093409921. The cubic root of 71490565 is about 415.0332677642.

The spelling of 71490565 in words is "seventy-one million, four hundred ninety thousand, five hundred sixty-five".